TANTALUM AND MOLYBDENUM BRAZING TECHNIQUES.
Rept. for 1 Jun 63-30 Jun 64,
NORTHROP CORP HAWTHORNE CALIF NORAIR DIV
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Brazed molybdenum and tantalum alloy honeycomb structures offer good potential for structural and heat shield applications in the 2500-3500 F range. However, molybdenum is seriously embrittled at braze temperatures above approximately 2500F. Tantalum alloys are not embrittled by high braze temperatures, but there are serious production problems associated with braze temperatures above 3200F. The purpose of this program was to develop molybdenum and tantalum braze systems which braze at relatively low temperatures, but develop high remelt and service temperatures. Some attention was also directed to the development of braze alloys for tantalum that braze several hundred degrees above the expected service temperature. Most of the effort was based on TZM molybdenum alloy and Ta-10W alloy. Some work was performed using Ta-8W-2Hf and Ta-30Cb-7. 5V.